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    <center>Scilab Function</center>
    <div align="right">Last update : April 1993</div>
    <p>
      <b>bstap</b> -  hankel approximant</p>
    <h3>
      <font color="blue">Calling Sequence</font>
    </h3>
    <dl>
      <dd>
        <tt>[Q]=bstap(Sl)  </tt>
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    <h3>
      <font color="blue">Parameters</font>
    </h3>
    <ul>
      <li>
        <tt>
          <b>sl</b>
        </tt>: linear system (<tt>
          <b>syslin</b>
        </tt> list) assumed continuous-time and anti-stable.</li>
      <li>
        <tt>
          <b>Q</b>
        </tt>: best stable approximation of <tt>
          <b>Sl</b>
        </tt> (<tt>
          <b>syslin</b>
        </tt> list).</li>
    </ul>
    <h3>
      <font color="blue">Description</font>
    </h3>
    <p>
    Computes the best approximant <tt>
        <b>Q</b>
      </tt> of the linear system <tt>
        <b>Sl</b>
      </tt>
    </p>
    <p>
    where</p>
    <p>
    ||T||</p>
    <p>
    is the  H-infinity norm of the Hankel operator associated with <tt>
        <b>Sl</b>
      </tt>.</p>
    <h3>
      <font color="blue">See Also</font>
    </h3>
    <p>
      <a href="../elementary/syslin.htm">
        <tt>
          <b>syslin</b>
        </tt>
      </a>,&nbsp;&nbsp;</p>
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